Idioms
An idiom is a type of phrase or expression that has a meaning that can't be deciphered by defining the individual words.
Idiom:
water down (something) or water (something) down
Meaning:
to make something weak, to dilute something
Example:
The new policy is a watered down version of the old one.
List of common idioms, their meanings and examples of their usage in sentences
A group of words which have a different meaning when used together from the one they would have if you took the meaning of each word separately.